Introduce `AbstractEvent` acting as all events' super class

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/event/PacketReceivedEvent.kt

-/*
- * Copyright 2020 Mamoe Technologies and contributors.
- *
- * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
- * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
- *
- * https://github.com/mamoe/mirai/blob/master/LICENSE
- */
-
-package net.mamoe.mirai.qqandroid.event
-
-import net.mamoe.mirai.qqandroid.network.Packet
-import net.mamoe.mirai.event.AbstractCancellableEvent
-import net.mamoe.mirai.event.Event
-
-/**
- * 接收到数据包
- */
-data class PacketReceivedEvent(val packet: Packet) : Event, AbstractCancellableEvent()
\ No newline at end of file

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/QQAndroidBotNetworkHandler.kt

@@ -26,7 +26,6 @@ import net.mamoe.mirai.network.UnsupportedSMSLoginException
 import net.mamoe.mirai.network.WrongPasswordException
 import net.mamoe.mirai.qqandroid.QQAndroidBot
 import net.mamoe.mirai.qqandroid.contact.*
-import net.mamoe.mirai.qqandroid.event.PacketReceivedEvent
 import net.mamoe.mirai.qqandroid.network.protocol.data.jce.StTroopNum
 import net.mamoe.mirai.qqandroid.network.protocol.data.proto.MsgSvc
 import net.mamoe.mirai.qqandroid.network.protocol.packet.*
@@ -511,10 +510,6 @@ internal class QQAndroidBotNetworkHandler(coroutineContext: CoroutineContext, bo
             }
         }
 
-        if (packet != null && PacketReceivedEvent(packet).broadcast().isCancelled) {
-            return
-        }
-
         if (packet is Event) {
             if (packet is BroadcastControllable) {
                 if (packet.shouldBroadcast) packet.broadcast()

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/protocol/packet/chat/receive/MessageSvc.kt

@@ -23,6 +23,7 @@ import net.mamoe.mirai.contact.Group
 import net.mamoe.mirai.contact.Member
 import net.mamoe.mirai.contact.MemberPermission
 import net.mamoe.mirai.data.MemberInfo
+import net.mamoe.mirai.event.AbstractEvent
 import net.mamoe.mirai.event.Event
 import net.mamoe.mirai.event.events.BotJoinGroupEvent
 import net.mamoe.mirai.event.events.BotOfflineEvent
@@ -36,7 +37,7 @@ import net.mamoe.mirai.qqandroid.contact.GroupImpl
 import net.mamoe.mirai.qqandroid.contact.checkIsFriendImpl
 import net.mamoe.mirai.qqandroid.contact.checkIsMemberImpl
 import net.mamoe.mirai.qqandroid.message.*
-import net.mamoe.mirai.qqandroid.network.MultiPacketByIterable
+import net.mamoe.mirai.qqandroid.network.MultiPacket
 import net.mamoe.mirai.qqandroid.network.Packet
 import net.mamoe.mirai.qqandroid.network.QQAndroidClient
 import net.mamoe.mirai.qqandroid.network.protocol.data.jce.RequestPushForceOffline
@@ -50,7 +51,6 @@ import net.mamoe.mirai.qqandroid.network.protocol.packet.*
 import net.mamoe.mirai.qqandroid.network.protocol.packet.chat.GroupInfoImpl
 import net.mamoe.mirai.qqandroid.network.protocol.packet.chat.NewContact
 import net.mamoe.mirai.qqandroid.network.protocol.packet.list.FriendList
-import net.mamoe.mirai.qqandroid.utils._miraiContentToString
 import net.mamoe.mirai.qqandroid.utils.io.serialization.readProtoBuf
 import net.mamoe.mirai.qqandroid.utils.io.serialization.readUniPacket
 import net.mamoe.mirai.qqandroid.utils.io.serialization.toByteArray
@@ -129,7 +129,10 @@ internal class MessageSvc {
          */
         @MiraiInternalAPI
         open class Response(internal val syncFlagFromServer: MsgSvc.SyncFlag, delegate: List<Packet>) :
-            MultiPacketByIterable<Packet>(delegate) {
+            AbstractEvent(),
+            MultiPacket<Packet>,
+            Iterable<Packet> by (delegate) {
+
             override fun toString(): String =
                 "MessageSvc.PbGetMsg.Response(syncFlagFromServer=$syncFlagFromServer, messages=<Iterable>))"
         }

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/protocol/packet/chat/receive/OnlinePush.kt

@@ -17,6 +17,7 @@ import net.mamoe.mirai.LowLevelAPI
 import net.mamoe.mirai.contact.MemberPermission
 import net.mamoe.mirai.contact.nameCardOrNick
 import net.mamoe.mirai.data.FriendInfo
+import net.mamoe.mirai.event.AbstractEvent
 import net.mamoe.mirai.event.Event
 import net.mamoe.mirai.event.broadcast
 import net.mamoe.mirai.event.events.*
@@ -57,7 +58,7 @@ internal class OnlinePush {
         internal class SendGroupMessageReceipt(
             val messageRandom: Int,
             val sequenceId: Int
-        ) : Packet, Event, Packet.NoLog {
+        ) : Packet, Event, Packet.NoLog, AbstractEvent() {
             override fun toString(): String {
                 return "OnlinePush.PbPushGroupMsg.SendGroupMessageReceipt(messageRandom=$messageRandom, sequenceId=$sequenceId)"
             }

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/protocol/packet/login/ConfigPushSvc.kt

@@ -12,6 +12,7 @@ package net.mamoe.mirai.qqandroid.network.protocol.packet.login
 import kotlinx.io.core.ByteReadPacket
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.protobuf.ProtoId
+import net.mamoe.mirai.event.AbstractEvent
 import net.mamoe.mirai.event.Event
 import net.mamoe.mirai.qqandroid.QQAndroidBot
 import net.mamoe.mirai.qqandroid.network.Packet
@@ -39,7 +40,7 @@ internal class ConfigPushSvc {
     ) {
         override val canBeCached: Boolean get() = false
 
-        sealed class PushReqResponse : Packet, Event {
+        sealed class PushReqResponse : Packet, Event, AbstractEvent() {
             class Success(
                 val struct: PushReqJceStruct
             ) : PushReqResponse() {

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/Event.kt

@@ -11,14 +11,20 @@
 
 package net.mamoe.mirai.event
 
+import kotlinx.atomicfu.atomic
 import net.mamoe.mirai.event.internal.broadcastInternal
 import net.mamoe.mirai.utils.MiraiInternalAPI
+import net.mamoe.mirai.utils.PlannedRemoval
+import net.mamoe.mirai.utils.SinceMirai
+import kotlin.jvm.JvmSynthetic
 
 /**
  * 可被监听的类, 可以是任何 class 或 object.
  *
  * 若监听这个类, 监听器将会接收所有事件的广播.
  *
+ * 所有 [Event] 都应继承 [AbstractEvent] 而不要直接实现 [Event]. 否则将无法广播也无法监听.
+ *
  * @see subscribeAlways
  * @see subscribeOnce
  *
@@ -27,40 +33,83 @@ import net.mamoe.mirai.utils.MiraiInternalAPI
  * @see [broadcast] 广播事件
  * @see [subscribe] 监听事件
  */
-interface Event
+interface Event {
+
+    @Deprecated("""
+        Don't implement Event but extend AbstractEvent instead.
+    """, level = DeprecationLevel.HIDDEN) // so Kotlin class won't be compiled.
+    @Suppress("WRONG_MODIFIER_CONTAINING_DECLARATION", "PropertyName")
+    @get:JvmSynthetic // so Java user won't see it
+    internal val DoNotImplementThisClassButExtendAbstractEvent: Nothing
+}
 
 /**
- * 可被取消的事件
+ * 所有实现了 [Event] 接口的类都应该继承的父类.
+ */
+@SinceMirai("1.0.0")
+abstract class AbstractEvent : Event {
+    @Suppress("WRONG_MODIFIER_CONTAINING_DECLARATION", "PropertyName")
+    @get:JvmSynthetic // so Java user won't see it
+    @Deprecated("", level = DeprecationLevel.HIDDEN)
+    final override val DoNotImplementThisClassButExtendAbstractEvent: Nothing
+        get() = throw Error("Shouldn't be reached")
+
+    private val _intercepted = atomic(false)
+    private val _cancelled = atomic(false)
+
+
+    /**
+     * 事件是否已被拦截.
+     *
+     * 所有事件都可以被拦截, 拦截后低优先级的监听器将不会处理到这个事件.
+     */
+    @SinceMirai("1.0.0")
+    val isIntercepted: Boolean
+        get() = _intercepted.value
+
+    /**
+     * 拦截这个事件.
+     * 重复拦截时不会抛出异常.
      */
-interface CancellableEvent {
+    @SinceMirai("1.0.0")
+    fun intercept() {
+        _intercepted.value = true
+    }
+
+
     /**
      * 事件是否已取消.
+     *
+     * 事件需实现 [CancellableEvent] 接口才可以被取消,
+     * 否则此属性固定返回 false.
      */
-    val isCancelled: Boolean
+    val isCancelled: Boolean get() = _cancelled.value
 
     /**
      * 取消这个事件.
+     * 重复取消时不会抛出异常.
      */
-    fun cancel()
+    fun cancel() {
+        check(this is CancellableEvent) {
+            "Event $this is not cancellable"
+        }
+        _cancelled.value = true
+    }
 }
 
 /**
- * 可被取消的事件的实现
+ * 可被取消的事件
  */
-abstract class AbstractCancellableEvent : Event, CancellableEvent {
+interface CancellableEvent : Event {
     /**
      * 事件是否已取消.
      */
-    override val isCancelled: Boolean get() = _cancelled
-
-    private var _cancelled: Boolean = false
+    val isCancelled: Boolean
 
     /**
-     * 取消事件.
+     * 取消这个事件.
      */
-    override fun cancel() {
-        _cancelled = true
-    }
+    fun cancel()
 }
 
 /**
@@ -81,9 +130,20 @@ suspend fun <E : Event> E.broadcast(): E = apply {
 var EventDisabled = false
 
 /**
- * 可控制是否需要广播这个事件包
+ * 可控制是否需要广播这个事件
  */
 interface BroadcastControllable : Event {
+    /**
+     * 返回 `false` 时将不会广播这个事件.
+     */
     val shouldBroadcast: Boolean
         get() = true
 }
+
+
+@PlannedRemoval("1.1.0")
+@Deprecated(
+    "use AbstractEvent and implement CancellableEvent",
+    level = DeprecationLevel.ERROR,
+    replaceWith = ReplaceWith("AbstractEvent", "net.mamoe.mirai.event.AbstractEvent"))
+abstract class AbstractCancellableEvent : AbstractEvent(), CancellableEvent

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/events/BotEvents.kt

@@ -15,7 +15,7 @@ package net.mamoe.mirai.event.events
 import net.mamoe.mirai.Bot
 import net.mamoe.mirai.JavaFriendlyAPI
 import net.mamoe.mirai.contact.*
-import net.mamoe.mirai.event.AbstractCancellableEvent
+import net.mamoe.mirai.event.AbstractEvent
 import net.mamoe.mirai.event.BroadcastControllable
 import net.mamoe.mirai.event.CancellableEvent
 import net.mamoe.mirai.event.events.ImageUploadEvent.Failed
@@ -49,12 +49,12 @@ class EventCancelledException : RuntimeException {
 /**
  * [Bot] 登录完成, 好友列表, 群组列表初始化完成
  */
-data class BotOnlineEvent(override val bot: Bot) : BotActiveEvent
+data class BotOnlineEvent(override val bot: Bot) : BotActiveEvent, AbstractEvent()
 
 /**
  * [Bot] 离线.
  */
-sealed class BotOfflineEvent : BotEvent {
+sealed class BotOfflineEvent : BotEvent, AbstractEvent() {
 
     /**
      * 主动离线
@@ -85,7 +85,7 @@ sealed class BotOfflineEvent : BotEvent {
 data class BotReloginEvent(
     override val bot: Bot,
     val cause: Throwable?
-) : BotEvent, BotActiveEvent
+) : BotEvent, BotActiveEvent, AbstractEvent()
 
 // endregion
 
@@ -94,7 +94,7 @@ data class BotReloginEvent(
 /**
  * 主动发送消息
  */
-sealed class MessageSendEvent : BotEvent, BotActiveEvent, AbstractCancellableEvent() {
+sealed class MessageSendEvent : BotEvent, BotActiveEvent, AbstractEvent() {
     abstract val target: Contact
     final override val bot: Bot
         get() = target.bot
@@ -115,7 +115,7 @@ sealed class MessageSendEvent : BotEvent, BotActiveEvent, AbstractCancellableEve
 /**
  * 消息撤回事件. 可是任意消息被任意人撤回.
  */
-sealed class MessageRecallEvent : BotEvent {
+sealed class MessageRecallEvent : BotEvent, AbstractEvent() {
     /**
      * 消息原发送人
      */
@@ -197,7 +197,7 @@ val MessageRecallEvent.isByBot: Boolean
 data class BeforeImageUploadEvent(
     val target: Contact,
     val source: ExternalImage
-) : BotEvent, BotActiveEvent, AbstractCancellableEvent() {
+) : BotEvent, BotActiveEvent, AbstractEvent(), CancellableEvent {
     override val bot: Bot
         get() = target.bot
 }
@@ -208,7 +208,7 @@ data class BeforeImageUploadEvent(
  * @see Succeed
  * @see Failed
  */
-sealed class ImageUploadEvent : BotEvent, BotActiveEvent, AbstractCancellableEvent() {
+sealed class ImageUploadEvent : BotEvent, BotActiveEvent, AbstractEvent() {
     abstract val target: Contact
     abstract val source: ExternalImage
     override val bot: Bot
@@ -218,14 +218,14 @@ sealed class ImageUploadEvent : BotEvent, BotActiveEvent, AbstractCancellableEve
         override val target: Contact,
         override val source: ExternalImage,
         val image: Image
-    ) : ImageUploadEvent(), CancellableEvent
+    ) : ImageUploadEvent()
 
     data class Failed(
         override val target: Contact,
         override val source: ExternalImage,
         val errno: Int,
         val message: String
-    ) : ImageUploadEvent(), CancellableEvent
+    ) : ImageUploadEvent()
 }
 
 // endregion
@@ -236,7 +236,7 @@ sealed class ImageUploadEvent : BotEvent, BotActiveEvent, AbstractCancellableEve
  * 机器人被踢出群或在其他客户端主动退出一个群. 在事件广播前 [Bot.groups] 就已删除这个群.
  */
 @SinceMirai("0.36.0")
-sealed class BotLeaveEvent : BotEvent, Packet {
+sealed class BotLeaveEvent : BotEvent, Packet, AbstractEvent() {
     abstract val group: Group
 
     /**
@@ -261,7 +261,7 @@ data class BotGroupPermissionChangeEvent(
     override val group: Group,
     val origin: MemberPermission,
     val new: MemberPermission
-) : BotPassiveEvent, GroupEvent, Packet
+) : BotPassiveEvent, GroupEvent, Packet, AbstractEvent()
 
 /**
  * Bot 被禁言
@@ -272,7 +272,7 @@ data class BotMuteEvent(
      * 操作人.
      */
     val operator: Member
-) : GroupEvent, Packet, BotPassiveEvent {
+) : GroupEvent, Packet, BotPassiveEvent, AbstractEvent() {
     override val group: Group
         get() = operator.group
 }
@@ -285,7 +285,7 @@ data class BotUnmuteEvent(
      * 操作人.
      */
     val operator: Member
-) : GroupEvent, Packet, BotPassiveEvent {
+) : GroupEvent, Packet, BotPassiveEvent, AbstractEvent() {
     override val group: Group
         get() = operator.group
 }
@@ -296,7 +296,7 @@ data class BotUnmuteEvent(
 @MiraiExperimentalAPI
 data class BotJoinGroupEvent(
     override val group: Group
-) : BotPassiveEvent, GroupEvent, Packet
+) : BotPassiveEvent, GroupEvent, Packet, AbstractEvent()
 
 // region 群设置
 
@@ -323,7 +323,7 @@ data class GroupNameChangeEvent(
      */
     @SinceMirai("0.37.3")
     override val operator: Member?
-) : GroupSettingChangeEvent<String>, Packet, GroupOperableEvent {
+) : GroupSettingChangeEvent<String>, Packet, GroupOperableEvent, AbstractEvent() {
     @Deprecated("for binary compatibility", level = DeprecationLevel.HIDDEN)
     val isByBot: Boolean
         get() = operator == null
@@ -340,7 +340,7 @@ data class GroupEntranceAnnouncementChangeEvent(
      * 操作人. 为 null 时则是机器人操作
      */
     override val operator: Member?
-) : GroupSettingChangeEvent<String>, Packet, GroupOperableEvent
+) : GroupSettingChangeEvent<String>, Packet, GroupOperableEvent, AbstractEvent()
 
 
 /**
@@ -354,7 +354,7 @@ data class GroupMuteAllEvent(
      * 操作人. 为 null 时则是机器人操作
      */
     override val operator: Member?
-) : GroupSettingChangeEvent<Boolean>, Packet, GroupOperableEvent
+) : GroupSettingChangeEvent<Boolean>, Packet, GroupOperableEvent, AbstractEvent()
 
 
 /**
@@ -368,7 +368,7 @@ data class GroupAllowAnonymousChatEvent(
      * 操作人. 为 null 时则是机器人操作
      */
     override val operator: Member?
-) : GroupSettingChangeEvent<Boolean>, Packet, GroupOperableEvent
+) : GroupSettingChangeEvent<Boolean>, Packet, GroupOperableEvent, AbstractEvent()
 
 
 /**
@@ -379,7 +379,7 @@ data class GroupAllowConfessTalkEvent(
     override val new: Boolean,
     override val group: Group,
     val isByBot: Boolean // 无法获取操作人
-) : GroupSettingChangeEvent<Boolean>, Packet
+) : GroupSettingChangeEvent<Boolean>, Packet, AbstractEvent()
 
 /**
  * 群 "允许群员邀请好友加群" 功能状态改变. 此事件广播前修改就已经完成.
@@ -392,7 +392,7 @@ data class GroupAllowMemberInviteEvent(
      * 操作人. 为 null 时则是机器人操作
      */
     override val operator: Member?
-) : GroupSettingChangeEvent<Boolean>, Packet, GroupOperableEvent
+) : GroupSettingChangeEvent<Boolean>, Packet, GroupOperableEvent, AbstractEvent()
 
 
 // endregion
@@ -405,7 +405,7 @@ data class GroupAllowMemberInviteEvent(
 /**
  * 成员已经加入群的事件
  */
-sealed class MemberJoinEvent(override val member: Member) : GroupMemberEvent, BotPassiveEvent, Packet {
+sealed class MemberJoinEvent(override val member: Member) : GroupMemberEvent, BotPassiveEvent, Packet, AbstractEvent() {
     /**
      * 被邀请加入群
      */
@@ -422,7 +422,7 @@ sealed class MemberJoinEvent(override val member: Member) : GroupMemberEvent, Bo
 /**
  * 成员已经离开群的事件. 在事件广播前成员就已经从 [Group.members] 中删除
  */
-sealed class MemberLeaveEvent : GroupMemberEvent {
+sealed class MemberLeaveEvent : GroupMemberEvent, AbstractEvent() {
     /**
      * 成员被踢出群. 成员不可能是机器人自己.
      */
@@ -468,7 +468,7 @@ data class BotInvitedJoinGroupRequestEvent(
      * 邀请人昵称
      */
     val invitorNick: String
-) : BotEvent, Packet {
+) : BotEvent, Packet, AbstractEvent() {
     val invitor: Friend = this.bot.getFriend(invitorId)
 
     @JvmField
@@ -515,7 +515,7 @@ data class MemberJoinRequestEvent(
      * 申请人昵称
      */
     val fromNick: String
-) : BotEvent, Packet {
+) : BotEvent, Packet, AbstractEvent() {
     val group: Group = this.bot.getGroup(groupId)
 
     @JvmField
@@ -574,8 +574,9 @@ data class MemberCardChangeEvent(
     @PlannedRemoval("1.0.0")
     @Deprecated("operator is always unknown", level = DeprecationLevel.ERROR)
     override val operator: Member?
-) : GroupMemberEvent, Packet,
-    @Deprecated("operator is always unknown", level = DeprecationLevel.ERROR) GroupOperableEvent
+) : GroupMemberEvent, Packet, AbstractEvent(),
+    @Deprecated("operator is always unknown", level = DeprecationLevel.ERROR)
+    GroupOperableEvent
 
 /**
  * 成员群头衔改动. 一定为群主操作
@@ -599,7 +600,7 @@ data class MemberSpecialTitleChangeEvent(
      * 为 null 时则是机器人操作.
      */
     override val operator: Member?
-) : GroupMemberEvent, GroupOperableEvent
+) : GroupMemberEvent, GroupOperableEvent, AbstractEvent()
 
 // endregion
 
@@ -613,7 +614,7 @@ data class MemberPermissionChangeEvent(
     override val member: Member,
     val origin: MemberPermission,
     val new: MemberPermission
-) : GroupMemberEvent, BotPassiveEvent, Packet
+) : GroupMemberEvent, BotPassiveEvent, Packet, AbstractEvent()
 
 // endregion
 
@@ -630,7 +631,7 @@ data class MemberMuteEvent(
      * 操作人. 为 null 则为机器人操作
      */
     override val operator: Member?
-) : GroupMemberEvent, Packet, GroupOperableEvent
+) : GroupMemberEvent, Packet, GroupOperableEvent, AbstractEvent()
 
 /**
  * 群成员被取消禁言事件. 被禁言的成员都不可能是机器人本人
@@ -641,7 +642,7 @@ data class MemberUnmuteEvent(
      * 操作人. 为 null 则为机器人操作
      */
     override val operator: Member?
-) : GroupMemberEvent, Packet, GroupOperableEvent
+) : GroupMemberEvent, Packet, GroupOperableEvent, AbstractEvent()
 
 // endregion
 
@@ -659,8 +660,9 @@ data class FriendRemarkChangeEvent(
     override val bot: Bot,
     val friend: Friend,
     val newName: String
-) : BotEvent, Packet {
+) : BotEvent, Packet, AbstractEvent() {
 
+    @PlannedRemoval("1.0.0")
     @Deprecated("", level = DeprecationLevel.HIDDEN)
     @get:JvmSynthetic
     @get:JvmName("getFriend")
@@ -678,9 +680,10 @@ data class FriendAddEvent(
      * 新好友. 已经添加到 [Bot.friends]
      */
     val friend: Friend
-) : BotEvent, Packet {
+) : BotEvent, Packet, AbstractEvent() {
     override val bot: Bot get() = friend.bot
 
+    @PlannedRemoval("1.0.0")
     @Deprecated("", level = DeprecationLevel.HIDDEN)
     @get:JvmSynthetic
     @get:JvmName("getFriend")
@@ -695,9 +698,10 @@ data class FriendAddEvent(
 @SinceMirai("0.36.0")
 data class FriendDeleteEvent(
     val friend: Friend
-) : BotEvent, Packet {
+) : BotEvent, Packet, AbstractEvent() {
     override val bot: Bot get() = friend.bot
 
+    @PlannedRemoval("1.0.0")
     @Deprecated("", level = DeprecationLevel.HIDDEN)
     @get:JvmSynthetic
     @get:JvmName("getFriend")
@@ -732,7 +736,7 @@ data class NewFriendRequestEvent(
      * 群名片或好友昵称
      */
     val fromNick: String
-) : BotEvent, Packet {
+) : BotEvent, Packet, AbstractEvent() {
     @JvmField
     internal val responded: MiraiAtomicBoolean = MiraiAtomicBoolean(false)
 

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/ContactMessage.kt

@@ -24,11 +24,8 @@ import kotlinx.coroutines.async
 import kotlinx.coroutines.io.ByteReadChannel
 import net.mamoe.mirai.Bot
 import net.mamoe.mirai.contact.*
+import net.mamoe.mirai.event.*
 import net.mamoe.mirai.event.events.BotEvent
-import net.mamoe.mirai.event.selectMessages
-import net.mamoe.mirai.event.syncFromEvent
-import net.mamoe.mirai.event.syncFromEventOrNull
-import net.mamoe.mirai.event.whileSelectMessages
 import net.mamoe.mirai.message.data.*
 import net.mamoe.mirai.qqandroid.network.Packet
 import net.mamoe.mirai.utils.*
@@ -71,7 +68,7 @@ expect abstract class MessagePacket<TSender : User, TSubject : Contact> construc
     replaceWith = ReplaceWith("ContactMessage", "net.mamoe.mirai.message.ContactMessage")
 )
 @Suppress("NOTHING_TO_INLINE", "UNCHECKED_CAST")
-abstract class MessagePacketBase<out TSender : User, out TSubject : Contact> : Packet, BotEvent {
+abstract class MessagePacketBase<out TSender : User, out TSubject : Contact> : Packet, BotEvent, AbstractEvent() {
     /**
      * 接受到这条消息的
      */

mirai-core/src/jvmTest/kotlin/net/mamoe/mirai/event/EventTests.kt

@@ -15,7 +15,7 @@ import net.mamoe.mirai.utils.internal.runBlocking
 import kotlin.test.Test
 import kotlin.test.assertTrue
 
-class TestEvent : Event {
+class TestEvent : Event, AbstractEvent() {
     var triggered = false
 }
 
@@ -44,7 +44,7 @@ class EventTests {
     }
 
 
-    open class ParentEvent : Event {
+    open class ParentEvent : Event, AbstractEvent() {
         var triggered = false
     }